<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form  action="http://127.0.0.1:8000/backend/data_recovery/" method="POST" enctype="multipart/form-data">
      <!--name是必须的，后面可以价格multiple表示多选文件-->
    <input type="file" name="upload_file" id="file_id" accept=".txt" >
    <input type="submit" value="提交">
</form>
</body>
</html>